Mom plant needs more Magnesium?

I have an old established organic Mom plant that shows signs of Cal/Mag def. It looks like a little more Mag def and not so much Cal def. What is a good way to add in more Mag to an established plant?

I checked pH twice using different methods and am running plant pH 6.9 and am not over or under watering with water at pH 6.5. I do have Dolomite in the mix.

A Foliar spray with Cal/Mag + greened it up in a couple days. Can I slurry the plant with Dolomite or maybe EWC? This is making me crazy. Thanks

Foliar spray Epsom salts. Best way to deliver mag to a plant.

Add a half gram/gallon of epsom salts, the next couple waterings. Do this when it begins to show again. They love it.